Loud-speaker



June 10, 1930. LARSEN 1,763,399

- LOUD SPEAKER Fild Sept. 12. 1928 INVENTOR GAUTIER H.T. LARSEN j/Zk A ORNEY Pabnted June 10, 1930 UNITED STATES.

PATENT OFFICE GAUTIER HERMAN TEAL LARSEN, F EDiDHOVEN, NETHERLANDS, ASSIGNOR TO RADIO CORPORATION OF AMERICA, A CORPORATION OF DELAWARE LOUD-SPEAKER Application filed September 12, 1928, Serial No. 305,865, and in the Netherlands October 8, 1927.

This invention relates to an improved loudspeaker comprising a magnet system and an oscillation member or diaphragm which is operatively connected to the magnet system.

The object of the invention is to provide a loudspeaker construction that is so simple that its manufacture can be effected with a minimum outlay so as to permit the manufacturer to deliver the loudspeaker on sale at a very low price.

The loudspeaker, according to my invention, comprises a frame to which the diaphragm is secured, a magnet system for operating the diaphrgam, and a strap which is mounted on the frame and on which the magnet system is mounted. The strap is so constructed as to serve as a stand for the loudspeaker. The number of arts of the loudspeaker is thus limited to our pieces, namely a magnet system, a diaphragm, a frame and a strap.

For attaching the diaphragm to the frame the latter has; a circular slit in which astrip of yielding material is clamdped by means of a metal ring or hook, the iaphragm being attached to the strip. This enables the diaphragm to move freely at its edge so that it can oscillate as a stiff member.

The strap which is secured to the frame is provided with one or more members which are either pivoted or rigidly connected to the strap and which serve as a stand for the loudspeaker. The frame may be given the shape of a polygon, and one side of the polygon serves, with the member secured to t e strap as a support on which the loudspeaker rests.

According to one embodiment of my invention the member which is pivoted to the strap is provided with means that enable the attacliment of the loudspeaker to a vertical wal The component parts of the loudspeaker can be assembled in a very simple manner, only four manipulations being necessary to system is secure to the strap, then the diahra which has the stri of yieldin materia ready secured to it is. presse into the slit of the frame, next the strap is se- 60 cured to the frame so that the driving stud mount the loads aker. Firstly the magnet contacts with the diaphragm, finally, the stud is attached to the diaphragm, usually by soldering.

The accompanying drawing illustrates various embodiments of the invention. In the said drawing:

Figure l is a side-view of the loudspeaker according to the invention.

Figure 2 is a rear-view of the loudspeaker according to Figure 1.

Figure 3 is a side-view of the loudspeaker of Figure 1 in a position in 7hich it is suspended from a vertical wall.

Figure 4 shows the loudspeaker of Figure 1 suspended in a reverse position from a vertical wall.

Figure 5 is a sectional side-view taken on the line VV of Figure 2.

' Figure 6 is a side-view of a different embodiment of the invention.

Figure '7 is a rear-view of the construction of Figure 6. The loudspeaker shown in Figures 1 to 5 consists essentially of an oscillation member or diaphragm 1, a magnet system 2, a frame 3 and a strap 4. The magnet system 2 is not shown in detail as it is irrevelant to the scope of the invention. The magnet system is provided with a driving stud 5 which is connected by soldering or in any suitable manner to the diaphragm 1.

The diaphragm 1 is connected to the frame 3 by means of a yielding annular strip 6 (Fig ure 5.) The frame has a tapering slit 7 into which the yielding material 6 is clamped by means of a metal ring or hook 8. The clamping member 8 which may be in the form of a split ring, presses the yielding material 6 into the slit 7. The frame 3 has secured to it by means of screws 9 a strap 4 to which the magnet system 2 is secured. This strap is soconstructed as to enable its use as a stand for the loudspeaker. For this purpose the strap has pivoted to it a member 11 which, as shown in Figure 1, can be flapped out. The frame is constructed in the shape of a polygon so that one of the sides of this polygon in cooperation with the member 11 can serve as a support for the loudspeaker when the latter is placed on a horizontal plane. The memher 11 has apertures 12 and 13 which are adapted to receive members of a suitable sha e such as hooks in order to suspend the lou speaker from a vertical Wall, as clearly shown in Figures 3 and 4. This construction has the advantage that a loudspeaker can be placed Within a room in every simple manner without affecting the surroundings.

Figures 6 and 7 show a difl'erent embodiment of the invention. The difference of this embodiment consists in the shape of the strap 20 which on its lower side is provided with members 21 which are rigidly connected to the strap and serve as a stand for the loudspeaker. Owing to its simple construction this embodiment is also very suitable for the manufacture on a large scale of loudspeakers which are relatively cheap but which are not inferior in quality to the more expensive types.

I claim:

1. A loudspeaker comprising a magnet system, a diaphragm operatively connected with said magnet system, a frame for supporting said diaphragm, a member fastened to said frame for supporting said magnet system and means pivoted to said member for coacting with said frame to form a stand for said loudspeaker.

2. A loudspeaker comprising a magnet system, a diaphragm operatively connected with said magnet system, a frame for supporting sa1d diaphragm, a strap connected across said frame, said magnet system being mounted on said strap, and a member pivoted to said strap for coacting with part of said frame to form a stand for said loudspeaker, said member also being provided with means for enabling the attitchment of said loudspeaker to a vertical we 1.

3. In combination, a conical diaphragm, means for vibrating said diaphragm, a strip of yielding material fastened around the edge of said diaphragm, a frame having an annu- 'lar slit and a split ring for clamping said strip of yielding material into said annular slit. GAUTIER HERMAN THAL LARSEN. 

